<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<title>nrf51/Source/ext_sensors/sdio/sdio.c Source File</title>
<link href="tabs.css" rel="stylesheet" type="text/css" />
<link href="doxygen.css" rel="stylesheet" type="text/css" />
<link href="alias.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="alias.js"></script>

<link href="navtree.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="resize.js"></script>
<script type="text/javascript" src="navtree.js"></script>
<script type="text/javascript">
  $(document).ready(initResizable);
</script>
<link href="search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="search/search.js"></script>
<script type="text/javascript">
  $(document).ready(function() { searchBox.OnSelectItem(0); });
</script>


<script type="text/javascript">
  jQuery(document).ready(function () {
    if(gref){ // Number all _img and _table classes
      gref();
    }
  });
</script>

</head>
<body>
<div id="top"><!-- do not remove this div! -->

<div id="titlearea">
<table cellspacing="0" cellpadding="0">
 <tbody>
 <tr style="height: 56px;">
  
  
  <td style="padding-left: 0.5em;">
   <div id="projectname">nRF51 General Code Examples
   
   </div>
   
  </td>
  
  
  
 </tr>
 </tbody>
</table>
</div>

<!-- Generated by Doxygen 1.7.5 -->
<script type="text/javascript">
var searchBox = new SearchBox("searchBox", "search",false,'Search');
</script>
  <div id="navrow1" class="tabs">
    <ul class="tablist">
      <li><a href="index.html"><span>Main&#160;Page</span></a></li>
      <li><a href="modules.html"><span>Modules</span></a></li>
      <li><a href="annotated.html"><span>Data&#160;Structures</span></a></li>
      <li class="current"><a href="files.html"><span>Files</span></a></li>
      <li>
        <div id="MSearchBox" class="MSearchBoxInactive">
        <span class="left">
          <img id="MSearchSelect" src="search/mag_sel.png"
               onmouseover="return searchBox.OnSearchSelectShow()"
               onmouseout="return searchBox.OnSearchSelectHide()"
               alt=""/>
          <input type="text" id="MSearchField" value="Search" accesskey="S"
               onfocus="searchBox.OnSearchFieldFocus(true)" 
               onblur="searchBox.OnSearchFieldFocus(false)" 
               onkeyup="searchBox.OnSearchFieldChange(event)"/>
          </span><span class="right">
            <a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.png" alt=""/></a>
          </span>
        </div>
      </li>
    </ul>
  </div>
  <div id="navrow2" class="tabs2">
    <ul class="tablist">
      <li><a href="files.html"><span>File&#160;List</span></a></li>
      <li><a href="globals.html"><span>Globals</span></a></li>
    </ul>
  </div>
</div>
<div id="side-nav" class="ui-resizable side-nav-resizable">
  <div id="nav-tree">
    <div id="nav-tree-contents">
    </div>
  </div>
  <div id="splitbar" style="-moz-user-select:none;" 
       class="ui-resizable-handle">
  </div>
</div>
<script type="text/javascript">
  initNavTree('sdio_8c.html','');
</script>
<div id="doc-content">
<div class="header">
  <div class="headertitle">
<div class="title">nrf51/Source/ext_sensors/sdio/sdio.c</div>  </div>
</div>
<div class="contents">
<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* Copyright (c) 2009 Nordic Semiconductor. All Rights Reserved.</span>
<a name="l00002"></a>00002 <span class="comment"> *</span>
<a name="l00003"></a>00003 <span class="comment"> * The information contained herein is confidential property of Nordic</span>
<a name="l00004"></a>00004 <span class="comment"> * Semiconductor ASA.Terms and conditions of usage are described in detail</span>
<a name="l00005"></a>00005 <span class="comment"> * in NORDIC SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.</span>
<a name="l00006"></a>00006 <span class="comment"> *</span>
<a name="l00007"></a>00007 <span class="comment"> * Licensees are granted free, non-transferable use of the information. NO</span>
<a name="l00008"></a>00008 <span class="comment"> * WARRANTY of ANY KIND is provided. This heading must NOT be removed from</span>
<a name="l00009"></a>00009 <span class="comment"> * the file.</span>
<a name="l00010"></a>00010 <span class="comment"> *</span>
<a name="l00011"></a>00011 <span class="comment"> */</span>
<a name="l00012"></a>00012 
<a name="l00013"></a>00013 <span class="preprocessor">#include &lt;stdint.h&gt;</span>
<a name="l00014"></a>00014 
<a name="l00015"></a>00015 <span class="preprocessor">#include &quot;nrf.h&quot;</span>
<a name="l00016"></a>00016 <span class="preprocessor">#include &quot;nrf_delay.h&quot;</span>
<a name="l00017"></a>00017 <span class="preprocessor">#include &quot;<a class="code" href="sdio_8h.html" title="2-wire serial interface driver (compatible with ADNS2080 mouse sensor driver)">sdio.h</a>&quot;</span>
<a name="l00018"></a>00018 <span class="preprocessor">#include &quot;nrf_gpio.h&quot;</span>
<a name="l00019"></a>00019 
<a name="l00020"></a>00020 <span class="preprocessor">#include &quot;sdio_config.h&quot;</span>
<a name="l00021"></a>00021 
<a name="l00022"></a>00022 <span class="comment">/*lint ++flb &quot;Enter library region&quot; */</span>
<a name="l00023"></a>00023 
<a name="l00024"></a>00024 <span class="comment">/*lint -e717 -save &quot;Suppress do {} while (0) for these macros&quot; */</span>
<a name="l00025"></a>00025 <span class="preprocessor">#define SDIO_CLOCK_HIGH() do { NRF_GPIO-&gt;OUTSET = (1UL &lt;&lt; SDIO_CONFIG_CLOCK_PIN_NUMBER); } while (0) </span>
<a name="l00026"></a>00026 <span class="preprocessor">#define SDIO_CLOCK_LOW() do { NRF_GPIO-&gt;OUTCLR = (1UL &lt;&lt; SDIO_CONFIG_CLOCK_PIN_NUMBER); } while (0)</span>
<a name="l00027"></a>00027 <span class="preprocessor">#define SDIO_DATA_HIGH() do { NRF_GPIO-&gt;OUTSET = (1UL &lt;&lt; SDIO_CONFIG_DATA_PIN_NUMBER); } while (0) </span>
<a name="l00028"></a>00028 <span class="preprocessor">#define SDIO_DATA_LOW() do { NRF_GPIO-&gt;OUTCLR = (1UL &lt;&lt; SDIO_CONFIG_DATA_PIN_NUMBER); } while (0) </span>
<a name="l00029"></a>00029 <span class="preprocessor">#define SDIO_DATA_OUTPUT() do { NRF_GPIO-&gt;DIRSET = (1UL &lt;&lt; SDIO_CONFIG_DATA_PIN_NUMBER); } while (0) </span>
<a name="l00030"></a>00030 <span class="preprocessor">#define SDIO_CLOCK_OUTPUT() do { NRF_GPIO-&gt;DIRSET = (1UL &lt;&lt; SDIO_CONFIG_CLOCK_PIN_NUMBER); } while (0) </span>
<a name="l00031"></a>00031 <span class="preprocessor"></span><span class="comment">/*lint -restore */</span>
<a name="l00032"></a>00032 
<a name="l00033"></a>00033 <span class="comment">/*lint -emacro(845,SDIO_DATA_INPUT) // A zero has been given as right argument to operator &#39;|&#39;&quot; */</span>
<a name="l00034"></a>00034 
<a name="l00035"></a>00035 <span class="preprocessor">#define SDIO_DATA_INPUT() do {  \</span>
<a name="l00036"></a>00036 <span class="preprocessor">         nrf_gpio_cfg_input(25, NRF_GPIO_PIN_NOPULL);  \</span>
<a name="l00037"></a>00037 <span class="preprocessor">} while (0)</span>
<a name="l00038"></a>00038 <span class="preprocessor"></span>
<a name="l00039"></a>00039 <span class="preprocessor">#define SDIO_DATA_READ() ((NRF_GPIO-&gt;IN &gt;&gt; SDIO_CONFIG_DATA_PIN_NUMBER) &amp; 0x1UL) </span>
<a name="l00040"></a>00040 <span class="preprocessor">#define SDIO_CLOCK_READ() ((NRF_GPIO-&gt;IN &gt;&gt; SDIO_CONFIG_CLOCK_PIN_NUMBER) &amp; 0x1UL) </span>
<a name="l00041"></a>00041 <span class="preprocessor">#define SDIO_DELAY() nrf_delay_us(10) </span>
<a name="l00043"></a><a class="code" href="group__nrf__drivers__sdio.html#gafd362e60216c5346709cac28c7cc175b">00043</a> <span class="preprocessor">    void sdio_init(void)</span>
<a name="l00044"></a>00044 <span class="preprocessor"></span>{
<a name="l00045"></a>00045     SDIO_CLOCK_HIGH();
<a name="l00046"></a>00046     SDIO_DATA_HIGH();
<a name="l00047"></a>00047     SDIO_CLOCK_OUTPUT();
<a name="l00048"></a>00048     SDIO_DATA_INPUT();
<a name="l00049"></a>00049 
<a name="l00050"></a>00050     <span class="comment">// If slave is stuck in the middle of transfer, clock out bits until the slave ACKs the transfer</span>
<a name="l00051"></a>00051     <span class="keywordflow">for</span> (uint_fast8_t i=16; i--;)
<a name="l00052"></a>00052     {
<a name="l00053"></a>00053         SDIO_DELAY();
<a name="l00054"></a>00054         SDIO_CLOCK_LOW();
<a name="l00055"></a>00055         SDIO_DELAY();
<a name="l00056"></a>00056         SDIO_CLOCK_HIGH();
<a name="l00057"></a>00057         SDIO_DELAY();
<a name="l00058"></a>00058 
<a name="l00059"></a>00059         <span class="keywordflow">if</span> (SDIO_DATA_READ())
<a name="l00060"></a>00060         {
<a name="l00061"></a>00061             <span class="keywordflow">break</span>;
<a name="l00062"></a>00062         }
<a name="l00063"></a>00063     }
<a name="l00064"></a>00064 
<a name="l00065"></a>00065     <span class="keywordflow">for</span> (uint_fast8_t i=5; i--;)
<a name="l00066"></a>00066     {
<a name="l00067"></a>00067         SDIO_DELAY();
<a name="l00068"></a>00068         SDIO_CLOCK_LOW();
<a name="l00069"></a>00069         SDIO_DELAY();
<a name="l00070"></a>00070         SDIO_CLOCK_HIGH();
<a name="l00071"></a>00071     }
<a name="l00072"></a>00072 
<a name="l00073"></a>00073     SDIO_DATA_OUTPUT();
<a name="l00074"></a>00074     SDIO_DATA_HIGH();
<a name="l00075"></a>00075 
<a name="l00076"></a>00076     SDIO_DELAY();
<a name="l00077"></a>00077 }
<a name="l00078"></a>00078 
<a name="l00079"></a><a class="code" href="group__nrf__drivers__sdio.html#ga1ff0f4956042d92b01fc2dbeffe26284">00079</a> uint8_t <a class="code" href="group__nrf__drivers__sdio.html#ga1ff0f4956042d92b01fc2dbeffe26284">sdio_read_byte</a>(uint8_t address)
<a name="l00080"></a>00080 {
<a name="l00081"></a>00081     uint8_t data_byte = 0;
<a name="l00082"></a>00082 
<a name="l00083"></a>00083     SDIO_DATA_OUTPUT();
<a name="l00084"></a>00084 
<a name="l00085"></a>00085     <span class="keywordflow">for</span> (uint_fast8_t i=8; i--;)
<a name="l00086"></a>00086     {
<a name="l00087"></a>00087         SDIO_DELAY();
<a name="l00088"></a>00088 
<a name="l00089"></a>00089         SDIO_CLOCK_LOW();
<a name="l00090"></a>00090 
<a name="l00091"></a>00091         <span class="keywordflow">if</span> (address &amp; (1U &lt;&lt; i))
<a name="l00092"></a>00092         {
<a name="l00093"></a>00093             SDIO_DATA_HIGH();
<a name="l00094"></a>00094         }
<a name="l00095"></a>00095         <span class="keywordflow">else</span>
<a name="l00096"></a>00096         {
<a name="l00097"></a>00097             SDIO_DATA_LOW();
<a name="l00098"></a>00098         }
<a name="l00099"></a>00099 
<a name="l00100"></a>00100         SDIO_DELAY();
<a name="l00101"></a>00101 
<a name="l00102"></a>00102         SDIO_CLOCK_HIGH();
<a name="l00103"></a>00103     }
<a name="l00104"></a>00104 
<a name="l00105"></a>00105     nrf_delay_us(20);
<a name="l00106"></a>00106 
<a name="l00107"></a>00107     SDIO_DATA_INPUT();
<a name="l00108"></a>00108 
<a name="l00109"></a>00109     <span class="keywordflow">for</span> (uint_fast8_t i=8; i--;)
<a name="l00110"></a>00110     {
<a name="l00111"></a>00111         SDIO_CLOCK_LOW();
<a name="l00112"></a>00112         SDIO_DELAY();
<a name="l00113"></a>00113         SDIO_CLOCK_HIGH();
<a name="l00114"></a>00114         SDIO_DELAY();
<a name="l00115"></a>00115         data_byte |= (uint8_t)(SDIO_DATA_READ() &lt;&lt; i);
<a name="l00116"></a>00116     }
<a name="l00117"></a>00117 
<a name="l00118"></a>00118     SDIO_DATA_HIGH();
<a name="l00119"></a>00119     SDIO_DATA_OUTPUT();
<a name="l00120"></a>00120 
<a name="l00121"></a>00121     SDIO_DELAY();
<a name="l00122"></a>00122 
<a name="l00123"></a>00123     <span class="keywordflow">return</span> data_byte;
<a name="l00124"></a>00124 }
<a name="l00125"></a>00125 
<a name="l00126"></a><a class="code" href="group__nrf__drivers__sdio.html#ga95ee69dbe058216ef73012a1ff04c077">00126</a> <span class="keywordtype">void</span> <a class="code" href="group__nrf__drivers__sdio.html#ga95ee69dbe058216ef73012a1ff04c077">sdio_read_burst</a>(uint8_t *target_buffer, uint8_t target_buffer_size)
<a name="l00127"></a>00127 {
<a name="l00128"></a>00128     uint_fast8_t address = 0x63;
<a name="l00129"></a>00129 
<a name="l00130"></a>00130     SDIO_DATA_OUTPUT();
<a name="l00131"></a>00131 
<a name="l00132"></a>00132     <span class="keywordflow">for</span> (uint_fast8_t bit_index=8; bit_index--;)
<a name="l00133"></a>00133     {
<a name="l00134"></a>00134         SDIO_CLOCK_LOW();
<a name="l00135"></a>00135 
<a name="l00136"></a>00136         <span class="keywordflow">if</span> (address &amp; (1U &lt;&lt; bit_index))
<a name="l00137"></a>00137         {
<a name="l00138"></a>00138             SDIO_DATA_HIGH();
<a name="l00139"></a>00139         }
<a name="l00140"></a>00140         <span class="keywordflow">else</span>
<a name="l00141"></a>00141         {
<a name="l00142"></a>00142             SDIO_DATA_LOW();
<a name="l00143"></a>00143         }
<a name="l00144"></a>00144 
<a name="l00145"></a>00145         SDIO_CLOCK_HIGH();
<a name="l00146"></a>00146     }
<a name="l00147"></a>00147 
<a name="l00148"></a>00148     SDIO_DATA_INPUT();
<a name="l00149"></a>00149 
<a name="l00150"></a>00150     <span class="keywordflow">for</span> (uint_fast8_t target_buffer_index = 0; target_buffer_index &lt; target_buffer_size; target_buffer_index++)
<a name="l00151"></a>00151     {
<a name="l00152"></a>00152         target_buffer[target_buffer_index] = 0;
<a name="l00153"></a>00153 
<a name="l00154"></a>00154         <span class="keywordflow">for</span> (uint_fast8_t bit_index = 8; bit_index--;)
<a name="l00155"></a>00155         {
<a name="l00156"></a>00156             SDIO_CLOCK_LOW();
<a name="l00157"></a>00157             SDIO_CLOCK_HIGH();
<a name="l00158"></a>00158             target_buffer[target_buffer_index] |= (uint8_t)(SDIO_DATA_READ() &lt;&lt; bit_index);
<a name="l00159"></a>00159         }
<a name="l00160"></a>00160     }
<a name="l00161"></a>00161 }
<a name="l00162"></a>00162 
<a name="l00163"></a><a class="code" href="group__nrf__drivers__sdio.html#ga2e5d560f80ba374b7fe18f4e8a565ffd">00163</a> <span class="keywordtype">void</span> <a class="code" href="group__nrf__drivers__sdio.html#ga2e5d560f80ba374b7fe18f4e8a565ffd">sdio_write_byte</a>(uint8_t address, uint8_t data_byte)
<a name="l00164"></a>00164 {
<a name="l00165"></a>00165     <span class="comment">// Add write indication bit</span>
<a name="l00166"></a>00166     address |= 0x80;
<a name="l00167"></a>00167 
<a name="l00168"></a>00168     SDIO_DATA_OUTPUT();
<a name="l00169"></a>00169 
<a name="l00170"></a>00170     <span class="keywordflow">for</span> (uint_fast8_t i=8; i--;)
<a name="l00171"></a>00171     {
<a name="l00172"></a>00172         SDIO_DELAY();
<a name="l00173"></a>00173 
<a name="l00174"></a>00174         SDIO_CLOCK_LOW();
<a name="l00175"></a>00175 
<a name="l00176"></a>00176         <span class="keywordflow">if</span> (address &amp; (1U &lt;&lt; i))
<a name="l00177"></a>00177         {
<a name="l00178"></a>00178             SDIO_DATA_HIGH();
<a name="l00179"></a>00179         }
<a name="l00180"></a>00180         <span class="keywordflow">else</span>
<a name="l00181"></a>00181         {
<a name="l00182"></a>00182             SDIO_DATA_LOW();
<a name="l00183"></a>00183         }
<a name="l00184"></a>00184 
<a name="l00185"></a>00185         SDIO_DELAY();
<a name="l00186"></a>00186 
<a name="l00187"></a>00187         SDIO_CLOCK_HIGH();
<a name="l00188"></a>00188     }
<a name="l00189"></a>00189 
<a name="l00190"></a>00190     SDIO_DELAY();
<a name="l00191"></a>00191 
<a name="l00192"></a>00192     <span class="keywordflow">for</span> (uint_fast8_t i=8; i--;)
<a name="l00193"></a>00193     {
<a name="l00194"></a>00194         SDIO_CLOCK_LOW();
<a name="l00195"></a>00195 
<a name="l00196"></a>00196         <span class="keywordflow">if</span> (data_byte &amp; (1U &lt;&lt; i))
<a name="l00197"></a>00197         {
<a name="l00198"></a>00198             SDIO_DATA_HIGH();
<a name="l00199"></a>00199         }
<a name="l00200"></a>00200         <span class="keywordflow">else</span>
<a name="l00201"></a>00201         {
<a name="l00202"></a>00202             SDIO_DATA_LOW();
<a name="l00203"></a>00203         }
<a name="l00204"></a>00204 
<a name="l00205"></a>00205         SDIO_DELAY();
<a name="l00206"></a>00206 
<a name="l00207"></a>00207         SDIO_CLOCK_HIGH();
<a name="l00208"></a>00208 
<a name="l00209"></a>00209         SDIO_DELAY();
<a name="l00210"></a>00210     }
<a name="l00211"></a>00211 
<a name="l00212"></a>00212     SDIO_DATA_HIGH();
<a name="l00213"></a>00213 
<a name="l00214"></a>00214     SDIO_DELAY();
<a name="l00215"></a>00215 }
<a name="l00216"></a>00216 
<a name="l00217"></a>00217 <span class="comment">/*lint --flb &quot;Leave library region&quot; */</span>
</pre></div></div>
</div>
  <div id="nav-path" class="navpath">
    <ul>
      <li class="navelem"><b>sdio.c</b>      </li>
<!-- window showing the filter options -->
<div id="MSearchSelectWindow"
     onmouseover="return searchBox.OnSearchSelectShow()"
     onmouseout="return searchBox.OnSearchSelectHide()"
     onkeydown="return searchBox.OnSearchSelectKey(event)">
<a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark">&#160;</span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark">&#160;</span>Data Structures</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark">&#160;</span>Files</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark">&#160;</span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark">&#160;</span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark">&#160;</span>Enumerations</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark">&#160;</span>Enumerator</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(7)"><span class="SelectionMark">&#160;</span>Defines</a></div>

<!-- iframe showing the search results (closed by default) -->
<div id="MSearchResultsWindow">
<iframe src="javascript:void(0)" frameborder="0" 
        name="MSearchResults" id="MSearchResults">
</iframe>
</div>


    <li class="footer">
      Copyright &copy 2006-2011 <a href="http://www.nordicsemi.no" style="text-decoration:none">Nordic Semiconductor</a>.
      All Rights Reserved.
      <a href="disclaimer.html">Disclaimer</a>
    </li>
   </ul>
 </div>


</body>
</html>
